Poor mommy! It is tuff when you're in school isn't it? I think withholding water is a good idea and will help alot. Tink gets no water during the day while she's crated. I am able to come home at noon so she gets just enough water to wet her whistle and a little play time - long enough to poop and pee, and then back in the crate 'til I come home later.
she is doing much better, but not traied yet. She usually goes on the pad, but not always. If I can't watch her evry minute, I either crate her or put a diaper on her. Depends on what I'm doing. I think it will be a way of life for us until she decides she wants to train. I'm finally OK with that.